What Is Object Oriented Programming in Java?


Heather Bennett

Object-oriented programming (OOP) is a programming paradigm that is widely used in Java and many other programming languages. It provides a way to structure and organize code by representing real-world objects as software objects. In this article, we will explore the key concepts and features of object-oriented programming in Java.

Objects and Classes

In OOP, everything revolves around objects. An object is an instance of a class, which serves as a blueprint for creating objects. A class defines the properties (also known as attributes or fields) and behaviors (methods) that an object can have.

To create an object in Java, you first need to define a class. Let’s say you want to create a class called Car.

You can define its attributes such as color, brand, and model. You can also define behaviors like startEngine(), accelerate(), and stop().

To use the Car class, you can create multiple instances of it, each representing a different car with its own set of attribute values. For example:

Car myCar = new Car();
myCar.color = "red";
myCar.brand = "Toyota";
myCar.model = "Camry";


Inheritance is another important concept in OOP. It allows you to create new classes based on existing classes, inheriting their attributes and behaviors. The existing class is called the parent class or superclass, while the new class is called the child class or subclass.

This enables code reuse and promotes code organization. For example, you can have a parent class called Animal with common attributes and behaviors, and then create child classes like Dog, Cat, and Bird that inherit from the Animal class. The child classes can also have their own unique attributes and behaviors.


Encapsulation is the practice of bundling data (attributes) and methods (behaviors) together in a class, hiding unnecessary details from other classes. This helps in achieving data security and provides a clear interface for interacting with objects.

In Java, you can control access to class members using access modifiers such as public, private, protected, or default (no modifier). For example, you might want to make certain attributes private to prevent direct access from outside the class. Instead, you can provide public methods (getters and setters) to access or modify those attributes.


Polymorphism is the ability of an object to take on many forms. In Java, polymorphism is achieved through method overriding and method overloading.

Method overriding allows a subclass to provide a different implementation of a method that is already defined in its superclass. This allows you to create specialized versions of methods for each subclass.

Method overloading, on the other hand, allows you to define multiple methods with the same name but different parameters within the same class. The appropriate method is called based on the number or type of arguments passed when invoking it.


Object-oriented programming in Java provides a powerful way to structure code by representing real-world objects as software objects. By using concepts such as objects and classes, inheritance, encapsulation, and polymorphism, developers can write more organized, reusable, and maintainable code.

Understanding these concepts is crucial for any Java developer, as it forms the foundation of Java programming. So dive into object-oriented programming and unleash the full potential of Java!

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